2001021221122 has 48 divisors (see below), whose sum is σ = 3809193805728. Its totient is φ = 779577765120.

The previous prime is 2001021221099. The next prime is 2001021221141. The reversal of 2001021221122 is 2211221201002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2001021221096 and 2001021221105.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28010653 + ... + 28081999.

It is an arithmetic number, because the mean of its divisors is an integer number (79358204286).

Almost surely, 2^{2001021221122} is an apocalyptic number.

2001021221122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2001021221122 is a deficient number, since it is larger than the sum of its proper divisors (1808172584606).

2001021221122 is a wasteful number, since it uses less digits than its factorization.

2001021221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97391 (or 97384 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2001021221122 its reverse (2211221201002), we get a palindrome (4212242422124).

The spelling of 2001021221122 in words is "two trillion, one billion, twenty-one million, two hundred twenty-one thousand, one hundred twenty-two".